NT98 donated by Danial Stocks
REL3D / NT98 S-band magnetron (E1189)
(see the end of this page for an internal view)
||The magnetron measures
190x75mm overall, plus leads, and weighs 550g.
E1189 was developed in mid-1940
from E1188, which was itself developed from Randall and Boot's original
cavity magnetron. It was the first magnetron suitable for use as a radar
transmitter. The first E1189 was 6-segment but was redesigned as 8-segment,
and an example was taken to the USA by the Tizard Mission in August 1940.
Used in Naval Radar Type 271,
the E1189 was later standardised as NT98. The REL3D is equivalent.
|Approx wavelength (NT98C)||10.05cm|
|Max anode dissipation||150W|
|Typical conditions at 500pps, 1µs pulse width;
1080 oersteds magnetic field|
|Peak anode voltage||9.5kV|
|Peak anode current||8A|
|Peak output power||8kW|
See also REL3C
Above: REL3D; Below: NT98. The serial number of this magnetron is Q24136 and it has the number
8827 written on the anode block.
Both faces of the magnetron,
showing the serial number 7665, and the marking J24 R.E.L.
REL3D serial 7427 opened up.
The output port is on the right but this magnetron was damaged and the
output loop has been distorted. Below is the cathode and heater. The cathode
cylinder measures approx. 22x5mm, the heater coil was supported at each
end by the fittings shown, and a mica insulator was placed between the
end of the heater and the metal plate that forms the side of the magnetron.
Shown also is one of the glass lead seals.
This file was last modified
15:33:34, Tuesday September 02, 2014